Laryngological examination requires special instruments, namely laryngoscope, laryngoscope classification a variety of: 1, indirect laryngoscope, is a small hard lens, can be placed above the pharynx down to shine; 2, fiber laryngoscope, fiber laryngoscope examination of patients a little less painful, from the nasal cavity into or from the mouth, the patient pain is small; 3, electronic laryngoscope, electronic laryngoscope is reflected to the television screen, the image is particularly clear, now electronic laryngoscope has a thinner mirror Nowadays, the electronic laryngoscope has a thinner mirror, which is less painful for patients and clearer for examination; 4, support laryngoscope, support laryngoscope is a relatively new type of laryngoscope, which can be fixed and can also be added with fiberscope during surgery. Support laryngoscope to do surgery is particularly clear, easy to operate operation, such as vocal cord polyps, vocal cord cysts, vocal cord nodules, laryngeal swelling, epiglottis cysts, this category can be used to support larynx to do a thorough examination.